Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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Naji, M.
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Vollmer, M.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (25/25 displayed)

  • 2025A new ISO standard for the experimental characterization of in-plane permeability of fibrous reinforcements1citations
  • 2024Microstructure and magnetic domain structure of additively manufactured Fe–Si soft magnetic alloys with 3 and 9 wt.-% Si6citations
  • 2023On the influence of crystallographic orientation on superelasticity - Fe-Mn-Al-Ni shape memory alloys studied by advanced in situ characterization techniques10citations
  • 2023Combined shape memory alloy phenomena: A novel approach to extend applications of shape memory alloys8citations
  • 2023Electron Beam Welding of Hot-Rolled Fe–Mn–Al–Ni Shape Memory Alloy Sheets7citations
  • 2022Application and potential of shape memory alloys for dowel-type connections in timber structures5citations
  • 2021Functionally graded structures realized based on Fe–Mn–Al–Ni shape memory alloys13citations
  • 2021On the polarisation and Mott-Schottky characteristics of an Fe-Mn-Al-Ni shape-memory alloy and pure Fe in NaCl-free and NaCl-contaminated Ca(OH)<inf>2,sat</inf> solution—A comparative study35citations
  • 2021Effect of Crystallographic Orientation and Grain Boundaries on Martensitic Transformation and Superelastic Response of Oligocrystalline Fe–Mn–Al–Ni Shape Memory Alloys26citations
  • 2020Induction Butt Welding Followed by Abnormal Grain Growth: A Promising Route for Joining of Fe–Mn–Al–Ni Tubes10citations
  • 2020Fatigue Crack Initiation in the Iron-Based Shape Memory Alloy FeMnAlNiTi15citations
  • 2020Adhesively bonded joints in components manufactured via selective laser melting9citations
  • 2020Effects of Thermomechanical Processing on the Microstructure and Mechanical Properties of Fe-Based Alloys6citations
  • 2019On the microstructural and functional stability of Fe-Mn-Al-Ni at ambient and elevated temperatures32citations
  • 2019Processing effects on tensile superelastic behaviour of Fe<inf>43.5</inf>Mn<inf>34</inf>Al<inf>15 ± X</inf>Ni<inf>7.5∓X</inf> shape memory alloyscitations
  • 2019FeMnNiAl Iron-Based Shape Memory Alloy: Promises and Challenges44citations
  • 2019Pathways Towards Grain Boundary Engineering for Improved Structural Performance in Polycrystalline Co–Ni–Ga Shape Memory Alloys11citations
  • 2017Cyclic Degradation Behavior of ⟨ 001 ⟩ -Oriented Fe–Mn–Al–Ni Single Crystals in Tension24citations
  • 2017On the effect of titanium on quenching sensitivity and pseudoelastic response in Fe-Mn-Al-Ni-base shape memory alloy55citations
  • 2016Effect of grain size on the superelastic response of a FeMnAlNi polycrystalline shape memory alloy66citations
  • 2016Cyclic degradation in bamboo-like Fe-Mn-Al-Ni shape memory alloys - The role of grain orientation73citations
  • 2016Microstructural Evolution and Functional Properties of Fe-Mn-Al-Ni Shape Memory Alloy Processed by Selective Laser Melting60citations
  • 2015Functional properties of iron based shape memory alloys containing finely dispersed precipitatescitations
  • 2015On the effect of gamma phase formation on the pseudoelastic performance of polycrystalline Fe-Mn-Al-Ni shape memory alloys101citations
  • 2015Fatigue Strength Prediction for Titanium Alloy TiAl6V4 Manufactured by Selective Laser Melting123citations

Places of action

Chart of shared publication
Kahlert, M.
1 / 2 shared
Backes, C.
1 / 3 shared
Niendorf, Thomas
24 / 301 shared
Smaga, M.
1 / 5 shared
Beck, T.
1 / 12 shared
Müller, M.
1 / 72 shared
Lehnert, R.
1 / 11 shared
Wendler, M.
1 / 13 shared
Biermann, Horst
5 / 342 shared
Korpala, G.
1 / 3 shared
Weidner, A.
4 / 104 shared
Volkova, O.
1 / 27 shared
Prahl, U.
1 / 10 shared
Krooß, P.
12 / 42 shared
Bauer, A.
4 / 37 shared
Wicke, P.
1 / 1 shared
Wiegand, M.
1 / 1 shared
Sommer, N.
1 / 1 shared
Böhm, S.
2 / 11 shared
Seim, W.
1 / 1 shared
Braun, M.
1 / 3 shared
Schwarze, R.
1 / 4 shared
Motylenko, M.
1 / 51 shared
Kriegel, M. J.
4 / 15 shared
Rafaja, D.
2 / 12 shared
Frenck, J.-M.
1 / 2 shared
Krüger, L.
1 / 31 shared
Hornig, R.
1 / 1 shared
Kietov, V.
1 / 1 shared
Mandel, M.
1 / 5 shared
Rafaja, David
3 / 293 shared
Wüstefeld, C.
1 / 17 shared
Niendorf, T.
1 / 11 shared
Vollmer, Malte
1 / 36 shared
Baunack, D.
1 / 2 shared
Janoschka, D.
1 / 1 shared
Abuzaid, W.
2 / 5 shared
Sehitoglu, H.
2 / 4 shared
Sidharth, R.
2 / 2 shared
Richter, J.
1 / 24 shared
Kahlmeyer, M.
1 / 1 shared
Koch, C.
1 / 5 shared
Popa, M.
2 / 7 shared
Cojocaru, V. D.
1 / 6 shared
Mihalache, E.
1 / 1 shared
Gurău, C.
1 / 1 shared
Gurău, G.
1 / 1 shared
Cimpoeşu, N.
1 / 1 shared
Comăneci, R.-I.
1 / 1 shared
Bujoreanu, L.-G.
2 / 2 shared
Pricop, B.
2 / 3 shared
Leineweber, A.
1 / 11 shared
Walnsch, A.
1 / 3 shared
Klemm, V.
3 / 68 shared
Popa, Mihai
1 / 8 shared
Comaneci, R.-I.
1 / 1 shared
Gurau, G.
1 / 3 shared
Krooss, P.
1 / 2 shared
Wu, Y.
1 / 43 shared
Brenne, F.
3 / 32 shared
Alkan, S.
1 / 1 shared
Lauhoff, C.
1 / 14 shared
Chumlyakov, Y. I.
2 / 18 shared
Kireeva, I.
1 / 5 shared
Martin, S.
1 / 35 shared
Chumlyakov, Y.
1 / 5 shared
Karaman, I.
4 / 30 shared
Ma, J.
1 / 6 shared
Tseng, L. W.
2 / 2 shared
Somsen, Christoph
1 / 61 shared
Ozcan, H.
1 / 1 shared
Krooß, Philipp
1 / 36 shared
Biermann, H.
1 / 10 shared
Somsen, C.
2 / 28 shared
Günther, J.
3 / 9 shared
Schwarze, D.
1 / 7 shared
Kadletz, P. M.
1 / 6 shared
Maier, H. J.
1 / 116 shared
Segel, C.
1 / 10 shared
Tröster, T.
1 / 12 shared
Leuders, S.
1 / 15 shared
Chart of publication period
2025
2024
2023
2022
2021
2020
2019
2017
2016
2015

Co-Authors (by relevance)

  • Kahlert, M.
  • Backes, C.
  • Niendorf, Thomas
  • Smaga, M.
  • Beck, T.
  • Müller, M.
  • Lehnert, R.
  • Wendler, M.
  • Biermann, Horst
  • Korpala, G.
  • Weidner, A.
  • Volkova, O.
  • Prahl, U.
  • Krooß, P.
  • Bauer, A.
  • Wicke, P.
  • Wiegand, M.
  • Sommer, N.
  • Böhm, S.
  • Seim, W.
  • Braun, M.
  • Schwarze, R.
  • Motylenko, M.
  • Kriegel, M. J.
  • Rafaja, D.
  • Frenck, J.-M.
  • Krüger, L.
  • Hornig, R.
  • Kietov, V.
  • Mandel, M.
  • Rafaja, David
  • Wüstefeld, C.
  • Niendorf, T.
  • Vollmer, Malte
  • Baunack, D.
  • Janoschka, D.
  • Abuzaid, W.
  • Sehitoglu, H.
  • Sidharth, R.
  • Richter, J.
  • Kahlmeyer, M.
  • Koch, C.
  • Popa, M.
  • Cojocaru, V. D.
  • Mihalache, E.
  • Gurău, C.
  • Gurău, G.
  • Cimpoeşu, N.
  • Comăneci, R.-I.
  • Bujoreanu, L.-G.
  • Pricop, B.
  • Leineweber, A.
  • Walnsch, A.
  • Klemm, V.
  • Popa, Mihai
  • Comaneci, R.-I.
  • Gurau, G.
  • Krooss, P.
  • Wu, Y.
  • Brenne, F.
  • Alkan, S.
  • Lauhoff, C.
  • Chumlyakov, Y. I.
  • Kireeva, I.
  • Martin, S.
  • Chumlyakov, Y.
  • Karaman, I.
  • Ma, J.
  • Tseng, L. W.
  • Somsen, Christoph
  • Ozcan, H.
  • Krooß, Philipp
  • Biermann, H.
  • Somsen, C.
  • Günther, J.
  • Schwarze, D.
  • Kadletz, P. M.
  • Maier, H. J.
  • Segel, C.
  • Tröster, T.
  • Leuders, S.
OrganizationsLocationPeople

article

Processing effects on tensile superelastic behaviour of Fe<inf>43.5</inf>Mn<inf>34</inf>Al<inf>15 ± X</inf>Ni<inf>7.5∓X</inf> shape memory alloys

  • Popa, M.
  • Popa, Mihai
  • Comaneci, R.-I.
  • Gurau, G.
  • Niendorf, Thomas
  • Vollmer, M.
  • Krooss, P.
  • Bujoreanu, L.-G.
  • Pricop, B.
Abstract

<jats:title>Abstract</jats:title><jats:p>Fe<jats:sub>43.5</jats:sub>Mn<jats:sub>34</jats:sub>Al<jats:sub>15</jats:sub>Ni<jats:sub>7.5</jats:sub> was introduced in the current decade as a new superelastic alloy with great applicative potential due to: (i) superelastic behaviour over a thermal range of 200°C and (ii) recoverable strains up to 9.7 %. One of the key factors in enhancing the superelastic response of several shape memory alloys (SMAs) is the formation of an oligocrystalline structure, <jats:italic>i.e.</jats:italic> without triple junctions between grains, which is the result of an abnormal grain growth (AGG) process that can be induced by cyclic heat treatment (CHT). Considering that, up to present date, no systematic observations were reported on the effects of Al substitution with Ni, the present study aims to analyse precisely these effects of on the structure and properties of Fe<jats:sub>43.5</jats:sub>Mn<jats:sub>34</jats:sub>Al<jats:sub>15-x</jats:sub>Ni<jats:sub>7.5+x</jats:sub>, where x = 0; 1.5 and 3 at. %. The ingots with the five above mentioned compositions were: (i) cut by wire electrical discharge machining (WEDM); (ii) hot rolled (HR) at 1060°C with 43.7-70 % thickness reduction degrees; (iii) annealed (A) at 900°C/1h/water, (iv) cold rolled (CR) with 60-92.7 % thickness reduction degrees; (v) cut by WEDM under the configuration of tensile specimens; (vi) subjected to CHT between 1225 and 900°C with heating-cooling rates of 10°C/min (repeated three times) and final water cooling to 80°C before being subjected to (vii) final ageing (AT) at 200°C for 3 hours/water. After applying this complex thermomechanical procedure, the specimens were analysed by optical microscopy (OM) and the average diameter of crystalline grains was calculated based on dimensional measurements. Considering that the approximate specimen thickness was 1 mm, since the average grain size of thermomechanically treated specimens ranged between 1.3 and 3.7 mm, it can be concluded that oligocrystalline structure, characterized by grain size larger than specimen’s thickness/diameter has been obtained. Tensile tests were performed on thermomechanically treated specimens, both up to failure and by loading-unloading. The evolution of average hardness, during the five processing stages, HR-A-CR-CHT and AT was determined and discussed.</jats:p>

Topics
  • impedance spectroscopy
  • grain
  • grain size
  • hardness
  • aging
  • optical microscopy
  • wire
  • grain growth